江淮地区一次强飑线系统结构特征的数值模拟研究  

Numerical Simulation Study on Structural Features of a Strong Squall Line System in Yangtze-Huaihe River Basin

作　　者：崔强 王春明 岳甫璐 田亚杰 Cui Qiang;Wang Chunming;Yue Fulu;Tian Yajie(College of Meteorology and Oceanography,National University of Defense Technology,Nanjing 211101,China;No.78127 Troops of PLA,Chengdu 610011,China;No.63770 Troops of PLA,Meteorological Station,Weinan 714000,China)

机构地区：[1]国防科技大学气象海洋学院 [2]中国人民解放军78127部队 [3]中国人民解放军63770部队气象处

出　　处：《气象与环境科学》2018年第3期21-28,共8页Meteorological and Environmental Sciences

基　　金：国家自然科学基金项目(41275128)资助

摘　　要：利用NCEP/NCAR 1°×1°逐6 h再分析资料、WRF中尺度预报模式,对2014年7月30 31日发生在江淮地区的一次强飑线天气过程进行天气学分析和数值模拟研究。结果表明,飑线发生前大气低层水汽条件良好,中层阶梯槽引导高层干冷空气向下入侵后叠加在低层暖湿气流之上,使飑线发生区域不稳定能量累积,低空切变线促使不稳定能量释放,是此次飑线过程的主要触发机制。在分析飑线成熟阶段宏观特征及微物理特征的基础上,归纳总结了此次飑线在成熟阶段的内部结构模型。飑线系统处于成熟阶段时,在大气低层强回波核附近存在"冷池",这主要是降水粒子在下落过程中蒸发冷却形成的。降水粒子下落过程中拖曳周围空气形成下沉气流,下沉气流到达地面后形成的辐散气流是地面大风形成的关键。Using the NCEP/NCAR reanalysis data（1°×1°） by 6 h and WRF mesoscale model, the synoptic analysis and numerical simulation of a squall line in the Yangtze Huaihe river basin during July 3031, 2014 were studied. The results indicated that before the squall occurring, the water vapor condition in the lower atmosphere was abundant, the mid level stepped trough guided high level dry cold air intrusion downward and superimposed on the low level warm air, leading to the unstable energy accumulated, while low level shear line prompted unstable energy released, which was the main trigger mechanism for the squall line. Through analyzing the macro and micro structure of squall line in the mature stage, we classified and summaried the inner structure model of squall line in mature stage. When the squall line system was in the mature stage, due to the process of evaporation and cooling of precipitation particles, a “cold pool” appeared near the center of strong echo zone in the lower atmosphere. Furthermore, precipitation particles dragged the surrounding air and caused downdrafts, downdrafts reached the ground and diverged, which is the key to the formation of the surface strong wind.

关 键 词：飑线 天气学分析 数值模拟 结构特征 

分 类 号：P456.7[天文地球—大气科学及气象学]